altiumgerberpcb
I am currently working on a project and I'm about to get the Gerber files checked by FreeDFM.com. My question is, in my Gerber files, there are a couple that have the extension .C1 and .C2. In FreeDFM.com they want me to specify what these are (Inner copper layers, top layers etc.), but I have no idea what they are.
Any help in determining what these are would be very much appreciated!
As long as they are visible in pcbnew (not hidden), they should show up in the gerbers.
Make sure you select front and back silk when plotting the gerbers. The output should be named $PROJECT.gto or .gbo, if i'm not mistaken. (gerber, top|bottom outline).
I have downloaded the design you are dealing with. The gerber files, all layer files have .PHO extension.
If you rename the files as follows you will be able to open them in Altium:
I have identified the layers by the PDF appendix. For Pastemask (GBP, GBT) and Silkscreen layers you should search for their Altium extensions.
These modified files can be dragged and dropped into Altium, example for Top layer:
This way all layer files are easily openable in Altium.
Select the Menu → Tables → Layers Order option. Following dialog will be shown: Fill the cells as below.
Enable the Export to PCB option as follows: Menu → Tools → Netlist → Extract.
"After a netlist has been extracted from your CAM data, the File » Export » Export to PCB command becomes enabled" source
Now, select Menu → File → Export → Export to PCB and a new PCB document will be opened with the Top Layer.
Result:
Best Answer
Normally the mid-layers in Altium are .G1, .G2, etc. Top and bottom layers are .GTL and .GBL respectively.
Possibly you're mistaking the G for a C, or possibly the program could be configured to use those extensions (though I don't think the version of Altium we're using has that capability).